165061565 has 4 divisors (see below), whose sum is σ = 198073884. Its totient is φ = 132049248.

The previous prime is 165061543. The next prime is 165061571. The reversal of 165061565 is 565160561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103266244 + 61795321 = 10162^2 + 7861^2 .

It is a cyclic number.

It is not a de Polignac number, because 165061565 - 2¹⁰ = 165060541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16506152 + ... + 16506161.

It is an arithmetic number, because the mean of its divisors is an integer number (49518471).

Almost surely, 2^165061565 is an apocalyptic number.

It is an amenable number.

165061565 is a deficient number, since it is larger than the sum of its proper divisors (33012319).

165061565 is an equidigital number, since it uses as much as digits as its factorization.

165061565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33012318.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 165061565 is about 12847.6287695434. The cubic root of 165061565 is about 548.5488633496.

The spelling of 165061565 in words is "one hundred sixty-five million, sixty-one thousand, five hundred sixty-five".